Name：Opolong UHC Filte77mm camera front filter (L-UHC Filte77mm)
Specifications：
The front 77mm UHC filter is specially produced for camera lenses and is twisted in front of the lens like a UV filter. It is particularly suitable for selectively filtering out harmful urban light, especially artificial light (including mercury light, sodium light) and natural sky glow, at the medium and long focal lengths, allowing useful light emitted by nebulae to pass through efficiently. This filter has extremely high transmittance near the OI (496nm and 500nm), HB (486nm), NI (654nm and 658nm), Ha (656nm), and Sl (672nm) frequency bands, effectively improving the contrast of nebulae and reproducing rich nebula detailscharacteristic:
*Adopting German Schott B270 and double-sided polishing processing
*For emission spectral lines with a transmittance of over 98.5% and reflection below 0.5%
*The frame is made of high-quality aluminum alloy material and treated with anodizing and extinction
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